Which modality enables dynamic evaluation of joints?

• A. Thermography
• B. CT
• C. MRI
• D. Sonography

Answer: (D)

Dynamic evaluation of joints means watching how a joint behaves as it moves, not just what it looks like at rest. Ultrasound allows real-time visualization during motion, so you can observe tendon glide, ligament stability, subtle subluxations, and joint effusions as the joint is flexed and extended. This immediate feedback is invaluable for assessing impingement, instability, or other movement-related issues, and it’s performed with no radiation, is portable, and can be done quickly at the bedside or in clinic.

Thermography only maps surface temperature patterns and doesn’t reveal internal structures. CT gives detailed bone anatomy but is a static snapshot and involves radiation. MRI provides excellent soft-tissue detail but is typically static; while cine MRI exists, it’s less practical for routine dynamic assessment.